You mean the luggage service from the Eurostar? I've never used it as we prefer to go directly to our hotel when we arrive and get checked in to our room, only once was our room not ready. And the times we've taken the Eurostar home we had APs which gave us free storage at guest services at park entrance. Next trip we will just use left luggage at our hotel and factor in enough time to go collect our things before we need to be at the station.